Negative HP

This rule allows you to go into negative hit points. If your negative hit points reach twice your maximum hit points, you die instantly.   Every time you take damage, you fail one death save. Attacks against unconscious entities are not automatic criticals, and thus not automatic hits. Every time you recieve healing, you succeed one death save. If you reach 3 successes, you are stable but unconscious. The same is achieved if you recieve an effect to bring you to 0 hp (such as a healers kit).   If you recieve healing that brings you to at least 1 hp, you are alive and consious. You can do this once per long rest without a problem, but every subsequent revival grants one level of exhaustion.